101 Basic Series - Module 22 - CEU Education
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The units in an MCC can contain starters, circuit breakers, disconnect switches, drives, PLC's, operator interface panels, and device communication products.
NEMA assigns IP classifications for enclosures, while IEC uses a Type system.
Combination starters can have fusible or non-fusible disconnects.
The ________ horizontal wireways are isolated from the main horizontal bus that runs through each section of the structure.
NEMA establishes local electric codes that determine the proper selection of an enclosure type.
The main components of enclosed control include the following, EXCEPT:
Power stab unit
________ wiring means that there are terminal blocks within each unit, and the devices are factory wired to them.
________ wiring means there are no terminal blocks in the unit and control and load connections are made directly to the devices.
While the depth of an MCC can vary from 16" to 21", a typical MCC section is which of the following:
60" High and 30" Wide
90" High and 20" Wide
60" High and 20" Wide
90" High and 30" Wide
The smallest units in an MCC measure 6" high and can increase in size by 6" up to 72".
Multi-Pak group control can have 4 or 6 starters mounted in NEMA sizes 1 through 4 enclosures.
In an MCC, a motor control compartment is often referred to as a ________.
A column section in an MCC assembly is also referred to as a ________.
An enclosure rating that is designed for outdoor use, made of sheet steel, have a gasket on the cover, and may have a blank cover plate attached to the top and most have knockouts on the bottom.
An enclosure rating that is used indoors where unusual conditions do not exist, are made of sheet steel, and depending on size may have knockouts for electrical cabling, would be.
Pull-apart terminal blocks are mounted such that they have access to the vertical wireway, and if a unit is pulled for maintenance, the wiring can remain within the center.
IEC and NEMA have set standards for the protection of devices in various environmental situations.
The vertical wireway in an MCC is located on the ________ of each section and extends the full height.
A typical custom panel has a fault current rating of 15,000 amps, much higher than that of an MCC.
These attach plug-in units to the MCC power bus bars.
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